US20130314297A1 - Antenna apparatus including two pairs of antennas provided respectively to be symmetric with respect to symmetric line - Google Patents
Antenna apparatus including two pairs of antennas provided respectively to be symmetric with respect to symmetric line Download PDFInfo
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- US20130314297A1 US20130314297A1 US13/955,510 US201313955510A US2013314297A1 US 20130314297 A1 US20130314297 A1 US 20130314297A1 US 201313955510 A US201313955510 A US 201313955510A US 2013314297 A1 US2013314297 A1 US 2013314297A1
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- antenna element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
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- Computer Networks & Wireless Communication (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
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Abstract
Description
- This is a continuation application based on PCT application No. PCT/JP2013/000401 as filed on Jan. 25, 2013, which claims priority to (1) Japanese patent application No. JP 2012-017703 as filed on Jan. 31, 2012, (2) Japanese patent application No. JP 2012-017704 as filed on Jan. 31, 2012, and (3) Japanese patent application No. JP 2012-027266 as filed on Feb. 10, 2012, the contents of which are incorporated herein by reference.
- The present disclosure relates to an antenna apparatus, a wireless communication apparatus including the antenna apparatus, and an electronic device including the wireless communication apparatus.
- Portable type electronic devices each having a wireless communication apparatus to receive broadcasting signals of terrestrial digital television broadcasting and the like, and a display apparatus to display the received broadcasting signals has been popularized. Such electronic devices use adaptive control of a combining diversity system or the like to combine in phase received signals received by a plurality of antenna elements as a method for achieving highly sensitive receiving. Moreover, a plurality of antennas need to be provided inside or outside the casing of the electronic device in order to perform adaptive control, and various methods are proposed concerning the configuration and arranging method of the plurality of antennas (See, for example, Patent Document 1).
- Patent Documents related to this disclosure are as follows:
- Patent Document 1: Japanese patent laid-open publication No. JP 2007-281906 A;
- Patent Document 2: Japanese patent publication No. JP 3618621 B2;
- Patent Document 3: Japanese patent laid-open publication No. JP 2011-151658 A; and
- Patent Document 4: U.S. Pat. No. 6,686,886.
- Generally speaking, in the electronic devices for use in a television broadcasting receiver apparatus or the like, the desired fractional bandwidth is about 40%, and an antenna apparatus having very wide band is required. However, in such electronic devices, the antenna cannot help being arranged in the vicinity of the grounding conductor of a circuit board or a conductor of a shield plate or the like in the electronic devices as the electronic devices are reduced in size. In this case, the gain of each antenna sometimes decreases. Moreover, in such electronic devices, the receiver sensitivity should be beneficially higher in various directions. However, when a plurality of antennas that use radio waves in an identical frequency band are used in order to improve the gain of the antenna apparatus of the electronic devices in various directions, signal mixing from other antennas occurs in each antenna attributed to electromagnetical coupling between the antennas, and the signal-to-noise ratio at the time of receiving by using the antennas is lowered, sometimes substantially decreasing the gain.
- An object of the present disclosure is to solve the aforementioned problems, and provide an antenna apparatus including a plurality of antennas and being able to prevent the decrease in the gain, a wireless communication apparatus including the antenna apparatus, and an electronic device including the wireless communication apparatus.
- According to the present disclosure, there is provided an antenna apparatus configured to include first, second, third and fourth antennas. The first antenna is configured to include a first radiating antenna element, that is formed to be substantially parallel to a predetermined first direction, and is fed with electric power from a first feeding point provided at a first edge portion of a grounding conductor. The second antenna is configured to include a second radiating antenna element, that is formed to be substantially parallel to a predetermined second direction different from the first direction, and is fed with electric power from a second feeding point provided at a second edge portion of the grounding conductor. The third antenna is configured to include a third radiating antenna element, that is formed to be substantially parallel to the second direction, and is fed with electric power from a third feeding point provided at the second edge portion of the grounding conductor. The fourth antenna is configured to include a fourth radiating antenna element, that is formed to be substantially parallel to the first direction, and is fed with electric power from a fourth feeding point provided at a third edge portion of the grounding conductor. The first and fourth antennas are provided to be symmetrical with respect to a predetermined symmetry line on the grounding conductor, and the second and third antennas are arranged to be symmetrical with respect to the symmetry line so that the second and third feeding points are separated apart by a predetermined distance.
- Accordingly, the antenna apparatus of the present disclosure can prevent decrease in the gain.
- These and other objects and features of the present invention will become clear from the following description taken in conjunction with the preferred embodiments thereof with reference to the accompanying drawings throughout which like parts are designated by like reference numerals, and in which:
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FIG. 1 is a perspective view of anelectronic device 100 according to a first embodiment of the present disclosure; -
FIG. 2 is a planview showing antennas electronic device 100 ofFIG. 1 and agrounding conductor 102 of anLCD panel 101 ofFIG. 1 ; -
FIG. 3 is a plan view of theantenna 1 ofFIG. 2 ; -
FIG. 4 is a plan view of theantenna 2 ofFIG. 2 ; -
FIG. 5 is a plan view of theantenna 3 ofFIG. 2 ; -
FIG. 6 is a plan view of theantenna 4 ofFIG. 2 ; -
FIG. 7 is a graph showing directional patterns of vertically polarized radio waves of theantenna 1 ofFIG. 2 ; -
FIG. 8 is a graph showing directional patterns of the vertically polarized radio waves of theantenna 2 ofFIG. 2 ; -
FIG. 9 is a graph showing directional patterns of the vertically polarized radio waves of theantenna 3 ofFIG. 2 ; -
FIG. 10 is a graph showing directional patterns of the vertically polarized radio waves of theantenna 4 ofFIG. 2 ; -
FIG. 11 is a graph showing directional patterns of the horizontally polarized radio waves of theantenna 1 ofFIG. 2 ; -
FIG. 12 is a graph showing directional patterns of the horizontally polarized radio waves of theantenna 2 ofFIG. 2 ; -
FIG. 13 is a graph showing directional patterns of the horizontally polarized radio waves of theantenna 3 ofFIG. 2 ; -
FIG. 14 is a graph showing directional patterns of the horizontally polarized radio waves of theantenna 4 ofFIG. 2 ; -
FIG. 15 is a graph showing radiation characteristics of theantennas FIG. 2 ; -
FIG. 16 is a block diagram showing a configuration of theelectronic device 100 ofFIG. 1 ; -
FIG. 17 is a plan view showing an antenna apparatus according to a modified embodiment of the first embodiment of the present disclosure; -
FIG. 18 is a plan view of theantenna 2A ofFIG. 17 ; -
FIG. 19 is a plan view of theantenna 3A ofFIG. 17 ; -
FIG. 20 is a graph showing radiation characteristics of theantennas FIG. 17 ; -
FIG. 21 is a plan view of an antenna apparatus according to a second embodiment of the present disclosure; and -
FIG. 22 is a plan view of an antenna apparatus according to a third embodiment of the present disclosure. - Embodiments will be described in detail below by arbitrarily referring to the drawings. It is noted that detailed description more than necessary are sometimes omitted. For example, detailed description of matters that are already well-known and repetitive explanation for a substantially identical configuration are sometimes omitted. This is to prevent the following description from being unnecessarily redundant and facilitate understanding by those skilled in the art.
- The inventor provides the accompanying drawings and the following description so as to make those skilled in the art sufficiently understand the present disclosure, and does not intend to limit the subject described in the claims for patent by them.
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FIG. 1 is a perspective view ofelectronic device 100 according to the first embodiment of the present disclosure, andFIG. 16 is a block diagram showing a configuration of theelectronic device 100 ofFIG. 1 . Moreover,FIG. 2 is a planview showing antennas electronic device 100 ofFIG. 1 , and thegrounding conductor 102 of the liquid crystal display panel (hereinafter, referred to as LCD) ofFIG. 1 . Further,FIGS. 3 , 4, 5 and 6 are plan views of theantennas FIG. 2 , respectively. - Referring to
FIGS. 1 , 2 and 16, theelectronic device 100 of the present embodiment is a portable type television broadcasting receiver apparatus for receiving radio waves in a frequency band (473 MHz to 767 MHz) of the terrestrial digital television broadcasting, and is configured to include anLCD panel 101, and awireless communication apparatus 105. Moreover, thewireless communication apparatus 105 is configured to include an antenna apparatus including theantennas conductors 102,dielectric substrates wireless communication circuit 104. In this case, as shown inFIG. 1 , theLCD panel 101 is provided on the front face of theelectronic device 100, and theLCD panel 101 is installed to be substantially perpendicular to the horizontal plane in theelectronic device 100. Further, a main circuit board (not shown) for controlling the entire electronic device is built in theelectronic device 100. In concrete, the main circuit board is, for example, a printed wiring board, and is configured to include a power supply circuit to supply power voltages to the circuits on the main circuit board, awireless communication circuit 104 with a tuner, and a driver circuit. In this case, thewireless communication circuit 105 includes a wireless receiver circuit connected to each of theantennas 1 to 4, and operates to perform a polarization diversity process for four received signals from the wireless receiver circuit, combine the received signals into one received signal by weighting them with weights proportional to the signal-to-noise ratio, and output the video signal and the audio signal included in the combined received signal. Moreover, the driver circuit performs predetermined image processing of the video signal from the tuner by driving theLCD panel 101, and displays the resulting image on theLCD panel 101. Further, theelectronic device 100 has built-in components such as an audio processing circuit to perform predetermined processing of the audio signal from thewireless communication circuit 104 and output the resulting signal to a loudspeaker, a recording apparatus and a reproducing apparatus for the video signal and the audio signal, and heat-radiating metal members for reducing heat generated from the components of the aforementioned main circuit board and the like. - Referring to
FIG. 2 , thegrounding conductor 102 of theLCD panel 101 is, for example, a conductor plate having a rectangular shape, and has anupside edge portion 102 a, a rightside edge portion 102 b perpendicular to theupside edge portion 102 a, and a leftside edge portion 102 c perpendicular to theedge portion 102 a. Moreover, thedielectric substrate 10 is fixed to theedge portion 102 b, thedielectric substrates edge portion 102 a, and thedielectric substrate 40 is fixed to theedge portion 102 c. Further, thedielectric substrates grounding conductor 102. Moreover, theantenna 1 is provided at theedge portion 102 b, and theantenna 2 is provided in the right half region of theedge portion 102 a. Theantenna 3 is provided in the left half region of theedge portion 102 a, and theantenna 4 is provided at theedge portion 102 c. It is noted that the rightward direction is referred to as an X-axis direction, and the upward direction is referred to as a Y-axis direction ofFIG. 2 . Further, the direction opposite to the X-axis direction is referred to as a −X-axis direction, and the direction opposite to the Y-axis direction is referred to as a −Y-axis direction. The Y-axis direction is substantially perpendicular to the X-axis direction. - As described in detail later, the antenna apparatus of the present embodiment is configured to include the following:
- (a) the
antenna 1 configured to include a radiatingantenna element 13, that is formed to be substantially parallel to the Y-axis direction and is fed with electric power from afeeding point 14 provided at theedge portion 102 b of thegrounding conductor 102; - (b) the
antenna 2 configured to include a radiatingantenna element 23, that is formed to be substantially parallel to the X-axis direction and is fed with electric power from afeeding point 24 provided at theedge portion 102 a of thegrounding conductor 102; - (c) the
antenna 3 configured to include a radiatingantenna element 33, that is formed to be substantially parallel to the X-axis direction and is fed with electric power from afeeding point 34 provided at theedge portion 102 a of thegrounding conductor 102; and - (d) the
antenna 4 configured to include a radiatingantenna element 43, that is formed to be substantially parallel to the Y-axis direction and is fed with electric power from afeeding point 44 provided at theedge portion 102 c of thegrounding conductor 102. - In this case, the antenna apparatus of the present embodiment is characterized in that the
antennas grounding conductor 102, and theantennas symmetry line 103 so that the feeding points 24 and 34 are separated apart by a predetermined distance. Thesymmetry line 103 is a symmetry line to divide into two parts, the lengthwise direction of thegrounding conductor 102 that is, for example, a conductor plate having a rectangular shape and passes through a weight center W of the conductor plate. In this case, thesymmetry line 103 passes through apoint 102 ap to divide theedge portion 102 a into two parts. - Referring to
FIG. 3 , theantenna 1 is described below by using an X1-Y1 coordinate system having a coordinate origin O1 which is one point on the edge portion on the left side of thedielectric substrate 10, and then, an axis in the upward direction ofFIG. 3 along an edge portion on the left side of thedielectric substrate 10 is defined as a Y1 axis, and an axis in the rightward direction ofFIG. 3 from the coordinate origin O1 is defined as an X1 axis. In this case, a direction opposite to the X1-axis direction is referred to as a −X1-axis direction, and a direction opposite to the Y1-axis direction is referred to as a −Y1-axis direction. It is noted that the axis Y1 is parallel to theedge portion 102 b. - Referring to
FIG. 3 , theantenna 1 is an inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 11, agrounding antenna element 12, a radiatingantenna element 13, and thefeeding point 14 on the coordinate origin O1. In this case, the feedingantenna element 11, thegrounding antenna element 12 and the radiatingantenna element 13 are each made of a conductive foil of copper, silver or the like formed on thedielectric substrate 10. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 10. - Referring to
FIG. 3 , the feedingantenna element 11 has one end connected to thefeeding point 14, and another end connected to theconnection point 13 a of the radiatingantenna element 13. The feedingantenna element 11 extends substantially in the X1-axis direction from thefeeding point 14 to another end connected to the radiatingantenna element 13. - Moreover, referring to
FIG. 3 , the radiatingantenna element 13 is configured to includeelement portions connection point 13 a. Moreover, one end of theelement portion 13A is connected to theconnection point 13 a, and another end of theelement portion 13A is anopen end 13 b. Theelement portion 13A is formed to extend from theconnection point 13 a substantially in the −Y1-axis direction along an edge portion of thedielectric substrate 10 and thereafter extend in the −X1-axis direction. - Moreover, the
element portion 13B extends from its one end connected to theconnection point 13 a to itsother end 13 c connected to one end of thegrounding antenna element 12 substantially in the Y1-axis direction along an edge portion of thedielectric substrate 10. Further, referring toFIG. 3 , thegrounding antenna element 12 extends from its one end connected to anotherend 13 c of theelement portion 13B substantially in the −X1-axis direction along an edge portion of thedielectric substrate 10, and anotherend 12 a of thegrounding antenna element 12 is grounded by being connected to theedge portion 102 b. - As described above, the
antenna 1 is configured to include thegrounding antenna element 12 having oneend 12 a connected to thegrounding conductor 102, the radiatingantenna element 13 that is formed to be substantially parallel to theedge portion 102 b of thegrounding antenna element 12 and has oneend 13 c connected to another end of thegrounding antenna element 12, and theopen end 13 b, and the feedingantenna element 11 configured to connect thefeeding point 14 with theconnection point 13 a on the radiatingantenna element 13. - The
antenna 1 configured as described above includes first to third radiating elements. In this case, as shown inFIG. 3 , the first radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 14 to theopen end 13 b of the radiatingantenna element 13 via thefeeding antenna element 11, theconnection point 13 a, and theelement portion 13A. The electrical length of the first radiating element is set to λ1/4 that is a quarter of wavelength and the first radiating element resonates at a resonance frequency f1 corresponding to the wavelength λ1 and is able to receive a wireless signal having a radio frequency of the resonance frequency f1. Moreover, the second radiating element is a loop antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 14 to anotherend 12 a of thegrounding antenna element 12 via thefeeding antenna element 11, theconnection point 13 a, and theelement portion 13B. The electrical length of the second radiating element is set to λ2/2 that is a half of wavelength λ2, and the second radiating element resonates at a resonance frequency f2 corresponding to the wavelength λ2 and is able to receive a wireless signal having a radio frequency of the resonance frequency f2. - Further, referring to
FIG. 3 , the third radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from theopen end 13 b of the radiatingantenna element 13 to anotherend 13 c of the radiatingantenna element 13 via theelement portions connection point 13 a with the feedingantenna element 11 used as a feeding line. Moreover, the electrical length of the third radiating element is set to λ3/4 that is a quarter of wavelength λ3, and the third radiating element resonates at a resonance frequency f3 corresponding to the wavelength λ3 and is able to receive the wireless signal having a radio frequency of the resonance frequency f3. - The
antenna 1 configured as described above receives vertically polarized radio waves parallel to the X1-axis direction. When the radio waves are received by theantenna 1, a received signal received by theantenna 1 is outputted to thewireless communication circuit 104 via thefeeding point 14 and a feeder cable. - Referring to
FIG. 4 , theantenna 2 is described below by using an X2-Y2 coordinate system in which one point on the downside edge portion of thedielectric substrate 20 is assumed to be a coordinate origin O2. An axis in the rightward direction ofFIG. 4 along the downside edge portion of thedielectric substrate 20 is assumed to be an X2 axis, and an axis in the upward direction ofFIG. 4 from the coordinate origin O2 is assumed to be a Y2 axis. In this case, a direction opposite to the X2 axis is referred to as a −X2 direction, and a direction opposite to the Y2 axis is referred to as a −Y2 direction. It is noted that the X2 axis is parallel to theedge portion 102 a. - Referring to
FIG. 4 , theantenna 2 is an inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 21, agrounding antenna element 22, a radiatingantenna element 23, and afeeding point 24 on the coordinate origin O2. In this case, the feedingantenna element 21, thegrounding antenna element 22 and the radiatingantenna element 23 are each made of a conductive foil of copper, silver or the like formed on thedielectric substrate 20. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 20. - Referring to
FIG. 4 , the feedingantenna element 21 has one end connected to thefeeding point 24, and another end connected to theconnection point 23 a of the radiatingantenna element 23. The feedingantenna element 21 extends substantially in the Y2-axis direction from thefeeding point 24 to another end connected to the radiatingantenna element 23. - Moreover, referring to
FIG. 4 , the radiatingantenna element 23 is configured to includeelement portions connection point 23 a. Theelement portion 23A extends substantially in the X2-axis direction along an edge portion of thedielectric substrate 20 from its one end connected to theconnection point 23 a to itsother end 23 c connected to one end of thegrounding antenna element 22. Moreover, one end of theelement portion 23B is connected to theconnection point 23 a, and another end of theelement portion 23B is anopen end 23 b. Theelement portion 23B is formed to extend from theconnection point 23 a substantially in the −X2-axis direction along an edge portion of thedielectric substrate 10, and thereafter extend in the −Y2-axis direction. - Further, the
grounding antenna element 22 extends substantially in the −X2-axis direction along an edge portion of thedielectric substrate 20 from its one end connected to anotherend 23 c of theelement portion 23A, and thereafter extends substantially in the −Y2-axis direction along an edge portion of thedielectric substrate 20, while anotherend 22 a of thegrounding antenna element 22 is grounded by being connected to theedge portion 102 b. - As described above, the
antenna 2 is configured to include thegrounding antenna element 22 having oneend 22 a connected to thegrounding conductor 102, the radiatingantenna element 23 that is formed to be substantially parallel to theedge portion 102 a of thegrounding conductor 102 and has oneend 23 c connected to another end of thegrounding antenna element 22 and theopen end 23 b, and the feedingantenna element 21 configured to connect thefeeding point 24 with theconnection point 23 a on the radiatingantenna element 23. - The
antenna 2 configured as described above includes fourth to sixth radiating elements. In this case, as shown inFIG. 4 , the fourth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 24 to theopen end 23 b of the radiatingantenna element 23 via thefeeding antenna element 21, theconnection point 23 a, and theelement portion 23B. The electrical length of the fourth radiating element is set to λ4/4 that is a quarter of wavelength λ4, and the fourth radiating element resonates at a resonance frequency f4 corresponding to the wavelength λ4 and is able to receive a wireless signal having a radio frequency of the resonance frequency f4. Moreover, the fifth radiating element is a loop antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 24 to anotherend 22 a of thegrounding antenna element 22 via thefeeding antenna element 21, theelement portion 23A, and thegrounding antenna element 22. The electrical length of the fifth radiating element is set to λ5/2 that is a half of wavelength λ5, and the fifth radiating element resonates at a resonance frequency f5 corresponding to the wavelength λ5 and is able to receive a wireless signal having a radio frequency of the resonance frequency f5. - Further, referring to
FIG. 4 , the sixth radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from theopen end 23 b of the radiatingantenna element 23 to anotherend 23 c of the radiatingantenna element 23 via theelement portions 2313 and 23A. The sixth radiating element is fed with electric power for excitation at theconnection point 23 a with the feedingantenna element 21 used as a feeding line. Moreover, the electrical length of the sixth radiating element is set to λ6/4 that is a quarter of wavelength λ6, and the sixth radiating element resonates at a resonance frequency f6 corresponding to the wavelength λ6 and is able to receive a wireless signal having a radio frequency of the resonance frequency f6. - The
antenna 2 configured as described above receives vertically polarized radio waves having a polarization direction parallel to the Y2-axis direction. When the radio waves are received by theantenna 2, a received signal received by theantenna 2 is outputted to thewireless communication circuit 104 via thefeeding point 24 and a feeder cable. - Referring to
FIG. 5 , theantenna 3 is described below by using a X3-Y3 coordinate system in which one point on the downside edge portion of thedielectric substrate 30 is assumed to be a coordinate origin O3. An axis in the rightward direction ofFIG. 5 along the downside edge portion of thedielectric substrate 30 is assumed to be an X3 axis, and an axis in the upward direction ofFIG. 5 from the coordinate origin O3 is assumed to be a Y3 axis. In this case, a direction opposite to the X3-axis direction is referred to as a −X3 axis direction, and a direction opposite to the Y3-axis direction is referred to as a −Y3-axis direction. It is noted that the X3 axis is parallel to theedge portion 102 a. - Referring to
FIG. 5 , theantenna 3 is an inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 31, agrounding antenna element 32, a radiatingantenna element 33, and afeeding point 34 on the coordinate origin O3. In this case, the feedingantenna element 31, thegrounding antenna element 32, and the radiatingantenna element 33 are each made of a conductive foil of copper, silver or the like formed on thedielectric substrate 30. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 30. - Referring to
FIG. 5 , the feedingantenna element 31 has one end connected to thefeeding point 34, and another end connected to theconnection point 33 a of the radiatingantenna element 33. The feedingantenna element 31 extends substantially in the Y3-axis direction from thefeeding point 34 to another end connected to the radiatingantenna element 33. - Referring to
FIG. 5 , the radiatingantenna element 33 is configured to includeelement portions connection point 33 a. Moreover, theelement portion 33A extends substantially in the −X3-axis direction along an edge portion of thedielectric substrate 30 from one end connected to theconnection point 33 a to anotherend 33 b connected to one end of thegrounding antenna element 32. Moreover, one end of theelement portion 33B is connected to theconnection point 33 a, and another end of theelement portion 33B is anopen end 33 c. Theelement portion 33B is formed to extend from theconnection point 33 a substantially in the X3-axis direction along an edge portion of thedielectric substrate 30, and thereafter extend in the −Y3-axis direction. - Further, referring to
FIG. 5 , thegrounding antenna element 32 extends from its one end connected to anotherend 33 b of theelement portion 33A substantially in the −Y3-axis direction along an edge portion of thedielectric substrate 10, and thereafter extends substantially in the X3-axis direction along an edge portion of thedielectric substrate 30, while anotherend 32 a of thegrounding antenna element 32 is grounded by being connected to theedge portion 102 c. - As described above, the
antenna 3 is configured to include thegrounding antenna element 32 having oneend 32 a connected to thegrounding conductor 102, the radiatingantenna element 33 that is formed to be substantially parallel to theedge portion 102 a of thegrounding conductor 102 and has oneend 33 b connected to another end of thegrounding antenna element 32, and theopen end 33 c, and the feedingantenna element 31 configured to connect thefeeding point 34 with theconnection point 33 a on the radiatingantenna element 33. - The
antenna 3 configured as described above includes seventh to ninth radiating elements. In this case, as shown inFIG. 5 , the seventh radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 34 to theopen end 33 c of the radiatingantenna element 33 via thefeeding antenna element 31, theconnection point 33 a, and theelement portion 33B. The electrical length of the seventh radiating element is set to λ7/4 that is a quarter of wavelength λ7, and the seventh radiating element resonates at a resonance frequency f7 corresponding to the wavelength λ7 and is able to receive a wireless signal having a radio frequency of the resonance frequency f7. Moreover, the eighth radiating element is a loop antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 34 to anotherend 32 a of thegrounding antenna element 32 via thefeeding antenna element 31, theelement portion 33A, and thegrounding antenna element 32. The electrical length of the eighth radiating element is set to λ8/2 that is a half of wavelength λ8, and the eighth radiating element resonates at a resonance frequency f8 corresponding to the wavelength λ8 and is able to receive a wireless signal having a radio frequency of the resonance frequency f8. - Further, referring to
FIG. 5 , the ninth radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from theopen end 33 c of the radiatingantenna element 33 to anotherend 33 b of the radiatingantenna element 33 via theelement portions connection point 33 a with the feedingantenna element 31 used as a feeding line. Moreover, the electrical length of the ninth radiating element is set to λ9/4 that is a quarter of wavelength λ9, and the ninth radiating element resonates at a resonance frequency f9 corresponding to the wavelength λ9 and is able to receive a wireless signal having a radio frequency of the resonance frequency f9. - The
antenna 3 configured as described above receives vertically polarized radio waves having a polarization direction parallel to the Y3-axis direction. When the radio waves are received by theantenna 3, a received signal received by theantenna 3 is outputted to thewireless communication circuit 104 via thefeeding point 34 and a feeder cable. - Referring to
FIG. 6 , theantenna 4 is described below by using an X4-Y4 coordinate system in which one point on the edge portion on the right side of thedielectric substrate 40 is assumed to be a coordinate origin O4. An axis in the upward direction ofFIG. 6 along an edge portion on the right side of thedielectric substrate 40 is assumed to be a Y4 axis, and an axis in the rightward direction ofFIG. 6 from the coordinate origin O4 is assumed to be an X4 axis. In this case, a direction opposite to the X4-axis direction is referred to as a −X4 axis direction, and a direction opposite to the Y4 axis is referred to as a −Y4-axis direction. It is noted that the Y4 axis is parallel to theedge portion 102 c. - Referring to
FIG. 6 , theantenna 4 is an inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 41, agrounding antenna element 42, a radiatingantenna element 43, and afeeding point 44 on the coordinate origin O4. In this case, the feedingantenna element 41, thegrounding antenna element 42 and the radiatingantenna element 43 are each made of a conductive foil of copper, silver or the like formed on thedielectric substrate 40. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 40. - Referring to
FIG. 6 , the feedingantenna element 41 has one end connected to thefeeding point 44, and another end connected to theconnection point 43 a of the radiatingantenna element 43. The feedingantenna element 41 extends substantially in the −X4-axis direction from thefeeding point 44 to another end connected to the radiatingantenna element 43. - Moreover, referring to
FIG. 6 , the radiatingantenna element 43 is configured to includeelement portions connection point 43 a. Moreover, one end of theelement portion 43A is connected to theconnection point 43 a, and another end of theelement portion 43A is anopen end 43 b. Theelement portion 43A is formed to extend from theconnection point 43 a substantially in the −Y4-axis direction along an edge portion of thedielectric substrate 40, and thereafter extend in the X4-axis direction. - Moreover, the
element portion 43B extends substantially in the Y4-axis direction along an edge portion of thedielectric substrate 40 from its one end connected to theconnection point 43 a to itsother end 43 c connected to one end of thegrounding antenna element 42. Further, referring toFIG. 6 , thegrounding antenna element 42 extends from its one end connected to anotherend 43 c of theelement portion 43B substantially in the X4-axis direction along an edge portion of thedielectric substrate 40, while anotherend 42 a of thegrounding antenna element 42 is grounded by being connected to theedge portion 102 c. - As described above, the
antenna 4 is configured to include thegrounding antenna element 42 having oneend 42 a connected to thegrounding conductor 102, the radiatingantenna element 43 that is formed to be substantially parallel to theedge portion 102 c of thegrounding conductor 102 and has oneend 43 c connected to another end of thegrounding antenna element 42, and theopen end 43 b, and the feedingantenna element 41 configured to connect thefeeding point 44 with theconnection point 43 a on the radiatingantenna element 43. - The
antenna 4 configured as described above includes tenth to twelfth radiating elements. In this case, as shown inFIG. 6 , the tenth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 44 to theopen end 43 b of the radiatingantenna element 43 via thefeeding antenna element 41, theconnection point 43 a, and theelement portion 43A. The electrical length of the tenth radiating element is set to λ10/4 that is a quarter of wavelength λ10, and the tenth radiating element resonates at a resonance frequency f10 corresponding to the wavelength λ10 and is able to receive a wireless signal having a radio frequency of the resonance frequency f10. Moreover, the eleventh radiating element is a loop antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 44 to anotherend 42 a of thegrounding antenna element 42 via thefeeding antenna element 41, theconnection point 43 a, theelement portion 43B, and thegrounding antenna element 42. The electrical length of the eleventh radiating element is set to λ11/2 that is a half of wavelength λ11, and the eleventh radiating element resonates at a resonance frequency f11 corresponding to the wavelength λ11 and is able to receive a wireless signal having a radio frequency of the resonance frequency f11. - Further, referring to
FIG. 6 , the twelfth radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from theopen end 43 b of the radiatingantenna element 43 to anotherend 43 c of the radiatingantenna element 43 via theelement portions connection point 43 a with the feedingantenna element 41 used as a feeding line. Moreover, the electrical length of the twelfth radiating element is set to λ12/4 that is a quarter of wavelength λ12, and the twelfth radiating element resonates at a resonance frequency f12 corresponding to the wavelength λ12 and is able to receive a wireless signal having a radio frequency of the resonance frequency f12. - The
antenna 4 configured as described above receives horizontally polarized radio waves parallel to the X4-axis direction. When the radio waves are received by theantenna 4, a received signal received by theantenna 4 is outputted to thewireless communication circuit 104 via thefeeding point 44 and a feeder cable. -
FIGS. 7 to 10 are graphs showing directional patterns of the vertically polarized radio waves of theantennas 1 to 4 ofFIG. 2 , respectively. Moreover,FIGS. 11 to 14 are graphs showing directional patterns of the horizontally polarized radio waves of theantennas 1 to 4 ofFIG. 2 , respectively. As shown inFIGS. 7 to 10 , the directional patterns of the vertically polarized radio waves of theantenna 1 and theantenna 4 are substantially omnidirectional in the whole frequency band for the terrestrial digital television broadcasting. -
FIG. 15 is a graph showing radiation characteristics of theantennas FIG. 2 . As shown inFIG. 15 , an average value of average gains in the frequency band for the terrestrial digital television broadcasting in all-around directions of theantennas - According to the antenna apparatus of the present embodiment, the
antennas antenna 1 receives the horizontally polarized radio waves, while theantenna 2 receives the vertically polarized radio waves. Therefore, the direction of a ground current flowing in the receiving operation of theantenna 1 and the direction of a ground current flowing in the receiving operation of theantenna 2 are orthogonal to each other. Therefore, the isolation between theantennas antennas - Moreover, the
antennas edge portion 102 a so as to be adjacent to each other, and theantennas symmetry line 103 and side by side with respect to thegrounding conductor 102, so that thefeeding point 24 of theantenna 2 and thefeeding point 34 of theantenna 3 are separated apart by a predetermined distance, and therefore, the isolation between theantennas antennas - Further, the
antenna 3 receives the vertically polarized radio waves, while theantenna 4 receives the horizontally polarized radio waves. Therefore, the direction of a ground current flowing in the receiving operation of theantenna 3 and the direction of a ground current flowing in the receiving operation of theantenna 4 are orthogonal to each other. Therefore, the isolation between theantennas antennas - According to the present embodiment, since four
antennas 1 to 4 can be provided in the vicinities of thegrounding conductor 102, theelectronic device 100 can be reduced in size further than those of the prior art. Moreover, since the antenna casing for housing the antenna apparatus including the fourantennas 1 to 4 needs not be provided in the others than the main body casing of theelectronic device 100, it is less expensive and superior in water resistance than those of the prior art. - Although the
grounding conductor 102 is used as the grounding conductor for the fourantennas 1 to 4 in the present embodiment, the present disclosure is not limited to this. It is acceptable to use the grounding plate of theelectronic device 100, such as the shield plate of theelectronic device 100 as the grounding conductor for the fourantennas 1 to 4. Moreover, although thegrounding conductor 102 has a rectangular shape, the present disclosure is not limited to this, and the conductor may have an arbitrary shape. - Moreover, in the present embodiment, the radiating
antenna elements antenna elements antenna elements antenna elements adjacent antennas antennas adjacent antennas antennas antennas antennas -
FIG. 17 is a plan view showing an antenna apparatus according to a modified embodiment of the first embodiment of the present disclosure.FIG. 18 is a plan view of theantenna 2A ofFIG. 17 , andFIG. 19 is a plan view of theantenna 3A ofFIG. 17 . Moreover, inFIGS. 17 , 18 and 19, the same components as those ofFIGS. 2 , 4 and 5 are denoted by same reference numerals, and no description is provided therefor. InFIG. 17 , the rightward direction is referred to as an X-axis direction, and the upward direction is referred to as a Y-axis direction. Further, a direction opposite to the X-axis direction is referred to as a −X-axis direction, and a direction opposite to the Y-axis direction is referred to as a −Y1-axis direction. Referring toFIG. 17 , the antenna apparatus of the present modified embodiment differs from the antenna apparatus (seeFIG. 2 ) of the first embodiment in thatantennas antennas - Referring to
FIG. 17 , theantennas symmetry line 103 on agrounding conductor 102, and theantennas symmetry line 103 so that feeding points 24 and 34 are separated apart by a predetermined distance. - The
antenna 1A differs from theantenna 1 in that theantenna 1A includes afeeding antenna element 15 in place of the feedingantenna element 11, and the feeding position to the radiatingantenna element 13 is provided shifted further in the Y1-axis direction than theconnection point 13 a. That is, in a case where the Y1-axis direction is referred to as an outward direction, and the −Y1-axis direction is referred to as an inward direction, the feeding position to the radiatingantenna element 13 is shifted in the inward direction at theedge portion 102 b of thegrounding conductor 102 by comparison with the first embodiment. One end of the feedingantenna element 15 of theantenna 1A is connected to thefeeding point 14, while the feedingantenna element 15 extends from thefeeding point 14 in the X1-axis direction, thereafter extends in the Y1-axis direction, further extends in the X1-axis direction, and is thereafter connected to apredetermined connection point 13 d of the radiatingantenna element 13. Theantenna 1A configured as described above operates in a manner similar to that of theantenna 1. - The
antenna 4A differs from theantenna 4 in that a feedingantenna element 45 is provided in place of the feedingantenna element 41, and the feeding position to the radiatingantenna element 43 is provided shifted further in the Y4-axis direction than theconnection point 43 a. That is, when the Y4-axis direction is referred to as an outward direction, and the −Y4-axis direction is referred to as an inward direction, the feeding position to the radiatingantenna element 43 is shifted further in the inward direction on theedge portion 102 c of thegrounding conductor 102 by comparison with the first embodiment. One end of the feedingantenna element 45 of theantenna 4A is connected to thefeeding point 44. The feedingantenna element 45 extends from thefeeding point 44 in the −X4-axis direction, thereafter extends in the Y4-axis direction, further extends in the −X4-axis direction, and is connected to thepredetermined connection point 43 d of the radiatingantenna element 43. Theantenna 4A configured as described above operates in a manner similar to that of theantenna 4. - Referring to
FIG. 18 , theantenna 2A is an inverted F antenna, and is configured to include thegrounding conductor 102, the feedingantenna element 25, agrounding antenna element 27, the radiatingantenna element 26, and thefeeding point 24. In this case, the feedingantenna element 25, thegrounding antenna element 27 and the radiatingantenna element 26 are each made of a conductive foil of copper, silver or the like formed on thedielectric substrate 20. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 20. Moreover, the feeding position (connection point 26 a) of theantenna 2A is provided in the outward direction with respect to thesymmetry line 103 by comparison with the feeding position (connection point 23 a) of theantenna 2 ofFIG. 2 . - Referring to
FIG. 18 , one end of the feedingantenna element 25 of theantenna 2A is connected to thefeeding point 24. The feedingantenna element 25 extends from thefeeding point 24 in the Y2-axis direction, thereafter extends in the X2-axis direction, extends in the Y2-axis direction to an edge portion of thedielectric substrate 20, and is thereafter connected to thepredetermined connection point 26 a of the radiatingantenna element 26. - Referring to
FIG. 18 , the radiatingantenna element 26 is configured to includeelement portions connection point 26 a. Theelement portion 26A extends from its one end connected to theconnection point 26 a to itsother end 26 c connected to one end of thegrounding antenna element 27 substantially in the −X2-axis direction along an edge portion of thedielectric substrate 20. Theelement portion 26B is formed to extend from theconnection point 26 a in the X2-axis direction along an edge portion of thedielectric substrate 20, and thereafter extend in the −Y2-axis direction. One end of theelement portion 26B is connected to theconnection point 26 a, and another end of theelement portion 26B is anopen end 26 b. - Further, the
grounding antenna element 27 extends from its one end connected to anotherend 26 c of theelement portion 26A substantially in the −Y2-axis direction along an edge portion of thedielectric substrate 20, and anotherend 26 a of thegrounding antenna element 27 is grounded by being connected to theedge portion 102 a. - As described above, the
antenna 2A of the present embodiment is configured to include thegrounding antenna element 27 having oneend 27 a connected to thegrounding conductor 102, the radiatingantenna element 26 that is formed to be substantially parallel to theedge portion 102 a of thegrounding conductor 102 and has oneend 26 c connected to another end of thegrounding antenna element 27, and theopen end 26 b, and the feedingantenna element 25 configured to connect thefeeding point 24 with theconnection point 26 a on the radiatingantenna element 26. - The
antenna 2A configured as described above includes thirteenth to fifteenth radiating elements. In this case, the thirteenth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 24 to theopen end 26 b of the radiatingantenna element 26 via thefeeding antenna element 25, theconnection point 26 a, and theelement portion 26B. The electrical length of the thirteenth radiating element is set to λ13/4 that is a quarter of wavelength λ13, and the thirteenth radiating element resonates at a resonance frequency f13 corresponding to the wavelength λ13 and is able to receive a wireless signal having a radio frequency of the resonance frequency f13. Moreover, the fourteenth radiating element is a loop antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 24 to anotherend 27 a of thegrounding antenna element 27 via thefeeding antenna element 25, theelement portion 26A, and thegrounding antenna element 27. The electrical length of the fourteenth radiating element is set to λ14/2 that is a half of wavelength λ14, and the fourteenth radiating element resonates at a resonance frequency f14 corresponding to the wavelength λ14 and is able to receive a wireless signal having a radio frequency of the resonance frequency f14. - Further, referring to
FIG. 18 , the fifteenth radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from theopen end 26 b of the radiatingantenna element 26 to anotherend 26 c of radiatingantenna element 26 via theelement portions connection point 26 a with the feedingantenna element 25 used as a feeding line. Moreover, the electrical length of the fifteenth radiating element is set to λ15/4 that is a quarter of wavelength λ15, and the fifteenth radiating element resonates at a resonance frequency f15 corresponding to the wavelength λ15 and is able to receive a wireless signal having a radio frequency of the resonance frequency f15. - The
antenna 2A configured as described above receives vertically polarized radio waves having a polarization direction parallel to the Y2-axis direction. When the radio waves are received by theantenna 2A, a received signal received by theantenna 2A is outputted to thewireless communication circuit 104 via thefeeding point 24 and a feeder cable. - Referring to
FIG. 19 , theantenna 3A is an inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 35, agrounding antenna element 37, a radiatingantenna element 36, and afeeding point 34. In this case, the feedingantenna element 35, thegrounding antenna element 37 and the radiatingantenna element 36 are each made of a conductive foil of copper, silver or the like formed on adielectric substrate 30. It is noted that no grounding conductor is farmed on the back surface of thedielectric substrate 30. Moreover, the feeding position (connection point 36 a) of theantenna 3A is provided shifted in the outward direction with respect to thesymmetry line 103 by comparison with the feeding position (connection point 33 a) of theantenna 3 ofFIG. 2 . - One end of the feeding
antenna element 35 is connected to thefeeding point 34. The feedingantenna element 35 extends from thefeeding point 34 in the Y3-axis direction, extends in the −X3-axis direction, extends in the Y3-axis direction to an edge portion of thedielectric substrate 30, and is thereafter connected to thepredetermined connection point 36 a of the radiatingantenna element 36. - Referring to
FIG. 19 , the radiatingantenna element 36 is configured to includeelement portions connection point 36 a. Moreover, one end of theelement portion 36B is connected to theconnection point 36 a, and another end of theelement portion 36B is anopen end 36 b. Theelement portion 36B is formed to extend from theconnection point 36 a substantially in the −X3-axis direction along an edge portion of thedielectric substrate 30, and thereafter extend in the −Y3-axis direction. Moreover, theelement portion 36A extends from its one end connected to theconnection point 36 a to itsother end 36 c connected to one end of thegrounding antenna element 37 substantially in the X3-axis direction along an edge portion of thedielectric substrate 30. - Further, referring to
FIG. 19 , thegrounding antenna element 37 extends from its one end connected to anotherend 36 c of theelement portion 36B substantially in the −Y3-axis direction along an edge portion of thedielectric substrate 30, and anotherend 37 a of thegrounding antenna element 37 is grounded by being connected to theedge portion 102 a. - As described above, the
antenna 3A is configured to include thegrounding antenna element 37 having oneend 37 a connected to thegrounding conductor 102, the radiatingantenna element 36 that is formed to be substantially parallel to theedge portion 102 a of thegrounding conductor 102 and has oneend 36 c connected to another end of thegrounding antenna element 37, and theopen end 36 b, and the feedingantenna element 35 configured to connect thefeeding point 34 with theconnection point 36 a on the radiatingantenna element 36. - The
antenna 3A configured as described above includes sixteenth to eighteenth radiating elements. In this case, as shown inFIG. 19 , the sixteenth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 34 to theopen end 36 b of the radiatingantenna element 36 via thefeeding antenna element 35, theconnection point 36 a, and theelement portion 36B. The electrical length of the sixteenth radiating element is set to λ16/4 that is a quarter of wavelength λ16, and the sixteenth radiating element resonates at a resonance frequency f16 corresponding to the wavelength λ16 and is able to receive a wireless signal having a radio frequency of the resonance frequency f16. Moreover, the seventeenth radiating element is a loop antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 34 to anotherend 37 a of thegrounding antenna element 37 via thefeeding antenna element 35, theelement portion 36A, and thegrounding antenna element 37. The electrical length of the seventeenth radiating element is set to λ17/2 that is a half of wavelength λ17, and the seventeenth radiating element resonates at a resonance frequency f17 corresponding to the wavelength λ17 and is able to receive a wireless signal having a radio frequency of the resonance frequency f17. - Further, referring to
FIG. 19 , the eighteenth radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from theopen end 36 b of the radiatingantenna element 36 to anotherend 36 c of the radiatingantenna element 36 via theelement portions connection point 36 a with the feedingantenna element 35 used as a feeding line. Moreover, the electrical length of the eighteenth radiating element is set to λ18/4 that is a quarter of wavelength λ18, and the eighteenth radiating element resonates at a resonance frequency f18 corresponding to the wavelength λ18 and is able to receive a wireless signal having a radio frequency of the resonance frequency f18. - The
antenna 3A configured as described above receives vertically polarized radio waves having a polarization direction parallel to the Y3-axis direction. When the radio waves are received by theantenna 3A, a received signal received by theantenna 3A is outputted to thewireless communication circuit 104 via thefeeding point 34 and a feeder cable. -
FIG. 20 is a graph showing radiation characteristics of theantennas FIG. 17 . As shown inFIG. 20 , an average value of average gains in the frequency band for the terrestrial digital television broadcasting in all-around directions of theantennas - According to the antenna apparatus of the present modified embodiment, the
antennas antenna 1A receives the horizontally polarized radio waves, while theantenna 2A receives the vertically polarized radio waves. Therefore, the direction of a ground current flowing in the receiving operation of theantenna 1A and the direction of a ground current flowing in the receiving operation of theantenna 2A are orthogonal to each other. Therefore, the isolation between theantennas antennas - Moreover, the
antennas edge portion 102 a to be adjacent to each other, are arranged side by side so that thefeeding point 24 of theantenna 2A and thefeeding point 34 of theantenna 3A are separated apart by a predetermined distance, and therefore, the isolation between theantennas antennas - Further, the
antenna 3A receives the vertically polarized radio waves, while theantenna 4A receives the horizontally polarized radio waves. Therefore, the direction of a ground current flowing in the receiving operation of theantenna 3A and the direction of a ground current flowing in the receiving operation of theantenna 4A are orthogonal to each other. Therefore, the isolation between theantennas antennas - According to the present modified embodiment, since the four
antennas 1A to 4A can be provided in the vicinities of thegrounding conductor 102, theelectronic device 100 can be reduced in size further than those of the prior art. Moreover, since the antenna casing for housing the antenna apparatus including the fourantennas 1A to 4A needs not be provided in the others than the main body casing of theelectronic device 100, it is less expensive and superior in water resistance than those of the prior art. - Although the
grounding conductor 102 is used as a grounding conductor for the fourantennas 1A to 4A in the present embodiment, the present disclosure is not limited to this. It is acceptable to use the grounding plate of theelectronic device 100, such as the shield plate of theelectronic device 100 as the grounding conductor for the fourantennas 1A to 4A. Moreover, although thegrounding conductor 102 has a rectangular shape, the present disclosure is not limited to this, and the conductor may have an arbitrary shape. - Moreover, in the present embodiment, the radiating
antenna elements antenna elements antenna elements antenna elements adjacent antennas antennas adjacent antennas antennas antennas antennas -
FIG. 21 is a plan view of an antenna apparatus according to the second embodiment of the present disclosure. The antenna apparatus of the present embodiment differs from the antenna apparatus of the first embodiment in thatantennas antennas FIG. 21 is referred to as an X-axis direction, and the upward direction is referred to as a Y-axis direction. Further, a direction opposite to the X-axis direction is referred to as a −X1-axis direction, and a direction opposite to the Y-axis direction is referred to as a −Y-axis direction. - Referring to
FIG. 21 ,dielectric substrates grounding conductor 102. Theantenna 201 is provided in the right half region of anedge portion 102 a, theantenna 202 is provided in the left half region of theedge portion 102 a, and theantenna 203 is provided at anedge portion 102 b. - Referring to
FIG. 21 , theantenna 204 is a monopole antenna, and is configured to include a radiating antenna element, and afeeding point 149 provided at a left end portion of theedge portion 102 a. The radiating antenna element of theantenna 204 extends in a direction (leftward direction ofFIG. 21 ) substantially parallel to theedge portion 102 a so as to protrude from theelectronic device 100. The electrical length of the radiating antenna element is set to λm/4 that is a quarter of wavelength λm, and horizontally polarized radio waves having a predetermined frequency fm corresponding to the wavelength λm is received. When the radio waves are received by theantenna 204, a received signal received by theantenna 204 is outputted to awireless communication circuit 104 via thefeeding point 149 and a feeder cable. Moreover, a ground current generated in accordance with the receiving operation of theantenna 204 flows in thegrounding conductor 102. - Referring to
FIG. 21 , theantenna 201 is an inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 111, agrounding antenna element 112, radiatingantenna elements 113 and 114, and afeeding point 119 provided at anedge portion 102 a. In this case, the feedingantenna element 111, thegrounding antenna element 112 and the radiatingantenna elements 113 and 114 are each made of a conductive foil of copper, silver or the like formed on a dielectric substrate 110. It is noted that no grounding conductor is formed on the back surface of the dielectric substrate 110. - Referring to
FIG. 21 , the feedingantenna element 111 is configured to includeelement portions 111A and 111B that are connected to each other at aconnection point 111 a. One end of the element portion 111A is connected to thefeeding point 119, thereafter extends in the Y-axis direction from thefeeding point 119, and is connected to theconnection point 111 a. Moreover, theelement portion 111B extends in the Y-axis direction from theconnection point 111 a to an edge portion of the dielectric substrate 110, and is thereafter connected to a predetermined connection point 113 a of the radiatingantenna element 113. The radiating antenna element 114 extends in the −X-axis direction from theconnection point 111 a, thereafter extends in the Y-axis direction to an edge portion of the dielectric substrate 110, and is connected to apredetermined connection point 113 b of the radiatingantenna element 113. - Moreover, referring to
FIG. 21 , the radiatingantenna element 113 is configured to include element portions 113A, 113B and 113C. In this case, the element portions 113A and 113B are connected to each other at theconnection point 113 b, while the element portions 113B and 113C are connected to each other at the connection point 113 a. The element portion 113B is formed to be substantially parallel to the −X-axis direction along an edge portion of the dielectric substrate 110 from the connection point 113 a to theconnection point 113 b. - Moreover, referring to
FIG. 21 , one end of the element portion 113A is connected to theconnection point 113 b, and another end of the element portion 113A is an open end 113 c. In this case, the element portion 113A extends from theconnection point 113 b substantially in the −X-axis direction along an edge portion of the dielectric substrate 110. Further, the element portion 113C extends from its one end connected to the connection point 113 a to another end 113 d connected to one end of thegrounding antenna element 112 substantially in the X-axis direction along an edge portion of the dielectric substrate 110. Further, referring toFIG. 21 , thegrounding antenna element 112 extends from its one end connected to another end 113 d of the element portion 113C substantially in the −Y-axis direction along an edge portion of thedielectric substrate 10, and another end 112 a of thegrounding antenna element 112 is grounded by being connected to theedge portion 102 a. - As described above, the
antenna 201 is configured to include thegrounding antenna element 112 having one end 112 a connected to thegrounding conductor 102, the radiatingantenna element 113 that is formed to be substantially parallel to theedge portion 102 a of thegrounding conductor 102 and has one end 113 d connected to another end of thegrounding antenna element 112, the feedingantenna element 111 configured to connect thefeeding point 119 with the connection point 113 a on the radiatingantenna element 113, and the radiating antenna element 114 configured to connect theconnection point 111 a on thefeeding antenna element 111 with theconnection point 113 b on the radiatingantenna element 113. - The
antenna 201 configured as described above includes nineteenth to twenty-second radiating elements. In this case, as shown inFIG. 21 , the nineteenth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 119 to the open end 113 c of the radiatingantenna element 113 via thefeeding antenna element 111, the element portion 113B, and the element portion 113A. The electrical length of the nineteenth radiating element is set to λ19/4 that is a quarter of wavelength λ19, and the nineteenth radiating element resonates at a resonance frequency f19 corresponding to the wavelength λ19 and is able to receive a wireless signal having a radio frequency of the resonance frequency f19. Moreover, the twentieth radiating element is a loop antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 119 to another end 112 a of thegrounding antenna element 112 via thefeeding antenna element 111, the element portion 113C, and thegrounding antenna element 112. The electrical length of the twentieth radiating element is set to λ20/4 that is a quarter of wavelength λ20, and the twentieth radiating element resonates at a resonance frequency f20 corresponding to the wavelength λ20 and is able to receive a wireless signal having a radio frequency of the resonance frequency f20. - Further, referring to
FIG. 21 , the twenty-first radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from the open end 113 c of the radiatingantenna element 113 to another end 113 d of the radiatingantenna element 113 via the element portions 113A, 113B and 113C. The twenty-first radiating element is fed with electric power for excitation at the connection point 113 a with the feedingantenna element 111 used as a feeding line. Moreover, the electrical length of the twenty-first radiating element is set to λ21/2 that is a half of wavelength λ21, and the twenty-first radiating element resonates at a resonance frequency f21 corresponding to the wavelength λ21 and is able to receive a wireless signal having a radio frequency of the resonance frequency f21. Moreover, the twenty-second radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 119 to the open end 113 c of the radiatingantenna element 113 via the element portion 111A, the radiating antenna element 114, and the element portion 113A. The electrical length of the twenty-second radiating element is set to λ22/4 that is a quarter of wavelength λ22, and the twenty-second radiating element resonates at a resonance frequency f22 corresponding to the wavelength λ22 and is able to receive a wireless signal having a radio frequency of the resonance frequency f22. - The
antenna 201 configured as described above receives vertically polarized radio waves having a polarization direction parallel to the Y-axis direction. When the radio waves are received by theantenna 201, a received signal received by theantenna 201 is outputted to awireless communication circuit 104 via thefeeding point 119 and a feeder cable. Moreover, a ground current generated in accordance with the receiving operation of theantenna 201 flows in thegrounding conductor 102. Moreover, since the radiating antenna element 114 is provided, the wireless signal having the resonance frequency f22 can be received in addition to the wireless signals having the resonance frequencies f19, f20 and f21. - Referring to
FIG. 21 , theantenna 202 is a T type antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 121, radiatingantenna elements feeding point 129 provided at theedge portion 102 a. In this case, the feedingantenna element 121 and the radiatingantenna elements dielectric substrate 120. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 120. - Referring to
FIG. 21 , one end of the feedingantenna element 121 is connected to thefeeding point 129, and the feedingantenna element 121 extends in the Y-axis direction from thefeeding point 129. Anopen end 121 a that is another end of the feedingantenna element 121 is formed to be adjacent so as to be capacitively coupled to a connection point of oneend 122 a of the radiatingantenna element 122 and oneend 123 a of the radiatingantenna element 123. In this case, the coupling capacitance C is generated between theopen end 121 a of the feedingantenna element 121 and a connection point between one ends 122 a and 123 b of the radiatingantenna elements antenna element 122 is formed to be substantially parallel to the −X-axis direction along an edge portion of thedielectric substrate 120 from the oneend 122 a to theopen end 122 b. Further, the radiatingantenna element 123 is formed to be substantially parallel to the X-axis direction along an edge portion of thedielectric substrate 120 from the oneend 123 a to theopen end 123 b. - As described above, the
antenna 202 is configured to include the feedingantenna element 121 having one end connected to thefeeding point 129, and the radiatingantenna elements edge portion 102 a of thegrounding conductor 102. In this case, theopen end 121 a that is another end of the feedingantenna element 121 is formed to generate the coupling capacitance C between theopen end 121 a and the connection point of one ends 122 a and 123 b of the radiatingantenna elements - The
antenna 202 configured as described above includes twenty-third to twenty-fifth radiating elements. In this case, as shown inFIG. 21 , the twenty-third radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 129 to theopen end 122 b of the radiatingantenna element 122 via thefeeding antenna element 121, the coupling capacitance C, and the radiatingantenna element 122. The electrical length of the twenty-third radiating element is set to (α+λ23/4) that is longer than a quarter of wavelength λ23, and the twenty-third radiating element resonates at a resonance frequency f23 corresponding to the wavelength λ23 and is able to receive a wireless signal having a radio frequency of the resonance frequency f23. It is noted that the electrical length α is set to an electrical length of, for example, λ23/20 to λ23/10. - Moreover, the twenty-fourth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from the
feeding point 129 to theopen end 123 b of the radiatingantenna element 123 via thefeeding antenna element 121, the coupling capacitance C, and the radiatingantenna element 123. The electrical length of the twenty-fourth radiating element is set to (β+λ24/4) that is longer than a quarter of wavelength λ24, and the twenty-fourth radiating element resonates at a resonance frequency f24 corresponding to the wavelength λ24 and is able to receive a wireless signal having a radio frequency of the resonance frequency f24. It is noted that theelectrical length 13 is set to an electrical length of, for example, λ24/20 to λ24/10. - Further, referring to
FIG. 21 , the twenty-fifth radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from theopen end 122 b of the radiatingantenna element 122 to theopen end 123 b of the radiatingantenna element 123 via the radiatingantenna element 122, the one ends 122 a and 123 a of the radiatingantenna elements antenna element 123. The twenty-fifth radiating element is fed with electric power for excitation at the connection point of the one ends 122 a and 123 b of the radiatingantenna elements antenna element 121 and the coupling capacitance C used as a feeding line. Moreover, the electrical length of the twenty-fifth radiating element is set to λ25/2 that is a half of wavelength λ25, and the twenty-fifth radiating element resonates at a resonance frequency f25 corresponding to the wavelength λ25 and is able to receive a wireless signal having a radio frequency of the resonance frequency f25. - The
antenna 202 configured as described above receives vertically polarized radio waves having a polarization direction parallel to the Y-axis direction. When the radio waves are received by theantenna 202, a received signal received by theantenna 202 is outputted to thewireless communication circuit 104 via thefeeding point 129 and a feeder cable. At this time, no ground current flows in thegrounding conductor 102 in accordance with the receiving operation of the twenty-fifth radiating element. Moreover, since the electrical length of the twenty-third radiating element is set to (α+λ23/4) that is longer than a quarter of wavelength λ23, the quantity of ground current flowing in thegrounding conductor 102 in accordance with the receiving operation of the twenty-third radiating element can be reduced by comparison with a case where the electrical length of the twenty-third radiating element is set to λ23/4 that is a quarter of wavelength λ23. Further, since the electrical length of the twenty-fourth radiating element is set to (α+λ24/4) that is longer than a quarter of wavelength λ24, the quantity of ground current flowing in thegrounding conductor 102 in accordance with the receiving operation of the twenty-fourth radiating element can be reduced by comparison with a case where the electrical length of the twenty-fourth radiating element is set to λ24/4 that is a quarter of wavelength λ24. - Further, the phase of the radiation waves excited at the receiving time of the
antenna 202 shifts from the phases of the radiation waves excited at the receiving time of theother antennas antenna 202 and theother antennas - Referring to
FIG. 21 , theantenna 203 is an inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 131, agrounding antenna element 132, radiatingantenna elements feeding point 139 provided at theedge portion 102 b. In this case, the radiatingantenna elements 131 to 137 are each made of a conductive foil of copper, silver or the like formed on thedielectric substrate 130. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 130. - Referring to
FIG. 21 , the radiatingantenna element 131 is configured to includeelement portions connection point 131 a. One end of theelement portion 131A is connected to thefeeding point 139. Theelement portion 131A extends in the X-axis direction from thefeeding point 139, and another end of theelement portion 131A is connected to theconnection point 131 a. Moreover, theelement portion 131B extends in the X-axis direction from theconnection point 131 a to an edge portion of the dielectric substrate 110, and is thereafter connected to apredetermined connection point 133 a of the radiatingantenna element 133. The radiatingantenna element 134 extends substantially in the −Y-axis direction from theconnection point 131 a, and is thereafter connected to apredetermined connection point 133 b of the radiatingantenna element 133. - Moreover, referring to
FIG. 21 , the radiatingantenna element 133 is configured to includeelement portions element portions connection point 133 b, while theelement portions 133B and 113C are connected to each other at theconnection point 133 a. Theelement portion 133B is formed to be substantially parallel to the −Y-axis direction along an edge portion of the dielectric substrate 110 from theconnection point 133 a to theconnection point 133 b. - Moreover, referring to
FIG. 21 , one end of theelement portion 133A is connected to theconnection point 133 b, and another end of theelement portion 133A is an open end 133 c. In this case, theelement portion 133A extends from theconnection point 133 b in the −X-axis direction along an edge portion of the dielectric substrate 110. Further, theelement portion 133C extends from its one end connected to theconnection point 133 a to anotherend 133 d connected to one end of thegrounding antenna element 132 substantially in the Y-axis direction along an edge portion of the dielectric substrate 110. Further, referring toFIG. 21 , thegrounding antenna element 132 extends from its one end connected to anotherend 133 d of the radiatingantenna element 133 in the −X-axis direction along an edge portion of the dielectric substrate 110, and anotherend 132 a of thegrounding antenna element 132 is grounded by being connected to theedge portion 102 b. - As described above, the
antenna 203 is configured to include thegrounding antenna element 132 having oneend 132 a connected to thegrounding conductor 102, the radiatingantenna element 133 that is formed to be substantially parallel to theedge portion 102 b of thegrounding conductor 102 and has one end connected to another end of thegrounding antenna element 132, the feedingantenna element 131 configured to connect thefeeding point 139 with theconnection point 133 a on the radiatingantenna element 133, and the radiatingantenna element 134 configured to connect theconnection point 131 a on thefeeding antenna element 131 with theconnection point 133 b on the radiatingantenna element 133. - The
antenna 203 configured as described above includes twenty-seventh to thirtieth radiating elements. In this case, as shown inFIG. 21 , the twenty-seventh radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 139 to the open end 133 c of the radiatingantenna element 133 via thefeeding antenna element 131, theelement portion 133B, and theelement portion 133A. The electrical length of the twenty-seventh radiating element is set to λ27/4 that is a quarter of wavelength λ27, and the twenty-seventh radiating element resonates at a resonance frequency f27 corresponding to the wavelength λ27 and is able to receive a wireless signal having a radio frequency of the resonance frequency f27. Moreover, the twenty-eighth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 139 to anotherend 132 a of thegrounding antenna element 132 via thefeeding antenna element 131, theelement portion 133C, and thegrounding antenna element 132. The electrical length of the twenty-eighth radiating element is set to λ28/4 that is a quarter of wavelength λ28, and the twenty-eighth radiating element resonates at a resonance frequency f28 corresponding to the wavelength λ28 and is able to receive a wireless signal having a radio frequency of the resonance frequency f28. - Further, referring to
FIG. 21 , the twenty-ninth radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from the open end 113 c of the radiatingantenna element 133 to anotherend 133 d of the radiatingantenna element 133 via theelement portions connection point 133 a with the feedingantenna element 131 used as a feeding line. Moreover, the electrical length of the twenty-ninth radiating element is set to λ29/2 that is a half of wavelength λ29, and the twenty-ninth radiating element resonates at a resonance frequency f29 corresponding to the wavelength λ29 and is able to receive a wireless signal having a radio frequency of the resonance frequency f29. Moreover, the thirtieth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 139 to the open end 133 c of the radiatingantenna element 133 via theelement portion 131A, the radiatingantenna element 134, and theelement portion 133A. The electrical length of the thirtieth radiating element is set to λ30/4 that is a quarter of wavelength λ30, and the thirtieth radiating element resonates at a resonance frequency f30 corresponding to the wavelength λ30 and is able to receive a wireless signal having a radio frequency of the resonance frequency f30. - The
antenna 203 configured as described above receives horizontally polarized radio waves having a polarization direction parallel to the X-axis direction. When the radio waves are received by theantenna 203, a received signal received by theantenna 203 is outputted to thewireless communication circuit 104 via thefeeding point 139 and a feeder cable. Moreover, a ground current generated in accordance with the receiving operation of theantenna 203 flows in thegrounding conductor 102. Moreover, since the radiatingantenna element 134 is provided, a wireless signal having the resonance frequency f30 can be received in addition to wireless signals having the resonance frequencies f27, f28 and f29. - According to the antenna apparatus of the present embodiment, the
antennas antenna 201 is connected to thegrounding conductor 102 via thegrounding antenna element 112, a ground current flows in thegrounding conductor 102 when the radio waves are received by theantenna 201 in accordance with the receiving. On the other hand, when the radio waves are received by theantenna 201, a ground current flows in thegrounding conductor 102 in accordance with the receiving operation of the twenty-third and twenty-fourth radiating elements that are the monopole antennas among the twenty-third to twenty-fifth radiating elements. However, since the electrical length of the twenty-third radiating element is set to (α+λ23/4), and the electrical length of the twenty-fourth radiating element is set to (β+λ24/4), the ground current is reduced further than when the twenty-third and twenty-fourth radiating elements have the electrical lengths λ23/4 and λ24/4, respectively. Therefore, the isolation between theantennas antennas - Moreover, since the
antenna 201 has the coupling capacitance C, the phase of radiation waves excited at the receiving time of theantenna 201 shifts from the phases of radiation waves excited at the receiving time of theother antennas antenna 201 and theother antennas antenna 201 does not have the coupling capacitance C. - Further, the
antennas antenna 201 receives vertically polarized radio waves, while theantenna 203 receives horizontally polarized radio waves. Therefore, the direction of the ground current in accordance with the receiving operation of theantenna 201 and the direction of the ground current in accordance with the receiving operation of theantenna 203 are orthogonal to each other. Therefore, the isolation between theantennas antennas - Moreover, the
antenna 201 receives vertically polarized radio waves, while theantenna 204 receives horizontally polarized radio waves. Therefore, the isolation between theantennas antennas antennas - Moreover, according to the present embodiment, the
antennas 201 to 204 can be provided in the vicinities of thegrounding conductor 102, and therefore, theelectronic device 100 can be further reduced in size than those of the prior art. Moreover, since the antenna casing for housing the antenna apparatus having theantennas 201 to 204 needs not be provided in the others than the main body casing of theelectronic device 100, it is less expensive and superior in water resistance than those of the prior art. - Although the
grounding conductor 102 is used as the grounding conductor for theantennas 201 to 204 in the present embodiment, the present disclosure is not limited to this. It is acceptable to use the grounding plate of theelectronic device 100, such as the shield plate of theelectronic device 100 as the grounding conductor for theantennas grounding conductor 102 has a rectangular shape in the present embodiment, the present disclosure is not limited to this, and the conductor may have an arbitrary shape. -
FIG. 22 is a plan view of an antenna apparatus according to the third embodiment of the present disclosure. The antenna apparatus of the present embodiment differs from the antenna apparatus of the first embodiment in that antennas 301, 302, 303 and 304 are provided in place of theantennas FIG. 2 . Further, a direction opposite to the X-axis direction is referred to as a −X-axis direction, and a direction opposite to the Y-axis direction is referred to as a −Y-axis direction. - Referring to
FIG. 22 ,dielectric substrates grounding conductor 102. Moreover, anantenna 401 is provided at anedge portion 102 b, anantenna 402 is provided in a right half region of theedge portion 102 a, and anantenna 403 is provided in a left half region of theedge portion 102 a. Anantenna 4 is provided in an upper left corner portion of agrounding conductor 102. Further, a loudspeaker (not shown) is provided on the back side of a lowerright edge portion 102 s of thegrounding conductor 102, and an operation panel (not shown) is provided on the left side of thegrounding conductor 102. - Referring to
FIG. 22 , theantenna 404 is a monopole antenna, and is configured to include a radiating antenna element and afeeding point 349 provided at a left end portion of theedge portion 102 a. The radiating antenna element extends in the −X-axis direction so as to protrude from theelectronic device 100. The electrical length of the radiating antenna element is set to λm/4 that is a quarter of wavelength λm, and receives horizontally polarized radio waves having a predetermined frequency fm corresponding to the wavelength λm. When the radio waves are received by theantenna 404, a received signal received by the antenna 440 is outputted to awireless communication circuit 104 via thefeeding point 349 and a feeder cable. - Referring to
FIG. 22 , theantenna 401 is an inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 311, agrounding antenna element 312, radiatingantenna elements feeding point 319 provided at anedge portion 102 b. In this case, the feedingantenna element 311, thegrounding antenna element 312, and the radiatingantenna elements dielectric substrate 310. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 310. - Referring to
FIG. 22 , the feedingantenna element 311 has one end connected to thefeeding point 319, and another end that includes a divergingportion 311C connected to apredetermined connection point 313 a of the radiatingantenna element 313. The feedingantenna element 311 extends substantially in the X-axis direction from thefeeding point 319 to the divergingportion 311C. In this case, the divergingportion 311C has a width set to expand from one end side of the feedingantenna element 311 toward theconnection point 313 a. - Moreover, referring to
FIG. 22 , the radiatingantenna element 313 is configured to includeelement portions connection point 313 a. Moreover, one end of theelement portion 313A is connected to theconnection point 313 a, and another end of theelement portion 313A is an open end 313 b. Theelement portion 313A extends from theconnection point 313 a substantially in the −Y-axis direction along an edge portion of thedielectric substrate 310. Moreover, theelement portion 313B extends from its one end connected to theconnection point 313 a to anotherend 313 c connected to one end of thegrounding antenna element 312 substantially in the Y-axis direction along an edge portion of thedielectric substrate 310. Further, referring toFIG. 22 , thegrounding antenna element 312 extends from its one end connected to anotherend 313 c of theelement portion 313B substantially in the −X-axis direction along an edge portion of thedielectric substrate 310, while anotherend 312 a of thegrounding antenna element 312 is grounded by being connected to theedge portion 102 b. - Referring to
FIG. 22 , one end of the radiatingantenna element 314 is connected to the divergingportion 311C, and another end of the radiatingantenna element 314 is anopen end 314 a. The radiatingantenna element 314 extends substantially in the −Y-axis direction from the divergingportion 311C. Moreover, the radiatingantenna element 314 is formed to be substantially parallel to theelement portion 313A so as to operate electromagnetically coupled to theelement portion 313A. - As described above, the
antenna 401 is configured to include thegrounding antenna element 312 having oneend 312 a connected to thegrounding conductor 102, the radiatingantenna element 313 that is formed to be substantially parallel to theedge portion 102 a of thegrounding conductor 102 and has oneend 313 c connected to another end of thegrounding antenna element 312, and the open end 313 b, the feedingantenna element 311 configured to connect thefeeding point 319 with theconnection point 313 a on the radiatingantenna element 313, and the radiatingantenna element 314. In this case, the radiatingantenna element 314 has one end connected to the divergingportion 311C, and anopen end 314 a, and is formed to be electromagnetically coupled to theelement portion 313A. - The
antenna 401 configured as described above includes thirtieth to thirty-fourth radiating elements. In this case, as shown inFIG. 22 , the thirtieth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 319 to the open end 313 b of the radiatingantenna element 313 via thefeeding antenna element 311, theconnection point 313 a, and theelement portion 313A. The electrical length of the first radiating element is set to λ30/4 that is a quarter of wavelength λ30, and the thirtieth radiating element resonates at a resonance frequency f30 corresponding to the wavelength λ30 and is able to receive a wireless signal having a radio frequency of the resonance frequency f30. Moreover, the thirty-first radiating element is a loop antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 319 to anotherend 312 a of thegrounding antenna element 312 via thefeeding antenna element 311, theconnection point 313 a, theelement portion 313B, and thegrounding antenna element 312. The electrical length of the thirty-first radiating element is set to λ31/4 that is a quarter of wavelength λ31, and the thirty-first radiating element resonates at a resonance frequency f31 corresponding to the wavelength λ31 and is able to receive a wireless signal having a radio frequency of the resonance frequency f31. - Further, referring to
FIG. 22 , the thirty-second radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from the open end 313 b of the radiatingantenna element 313 to anotherend 313 c of the radiatingantenna element 313 via theelement portions connection point 313 a with the feedingantenna element 311 used as a feeding line. Moreover, the electrical length of the thirty-second radiating element is set to λ32/2 that is a half of wavelength λ32, and the thirty-second radiating element resonates at a resonance frequency f32 corresponding to the wavelength λ32 and is able to receive a wireless signal having a radio frequency of the resonance frequency f32. Moreover, the thirty-third radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 319 to theopen end 314 a of the radiatingantenna element 314 via thefeeding antenna element 311, and the radiatingantenna element 314. The electrical length of the thirty-third radiating element is set to λ33/4 that is a quarter of wavelength λ33, and the thirty-third radiating element resonates at a resonance frequency f33 corresponding to the wavelength λ33 and is able to receive a wireless signal having a radio frequency of the resonance frequency f33. It is noted that the wavelength λ33 differs from the wavelength λ30. - Further, referring to
FIG. 22 , the thirtieth radiating element and the thirty-third radiating element are electromagnetically coupled to each other and operates as a thirty-fourth radiating element. In this case, the thirty-fourth radiating element resonates at a resonance frequency f34 corresponding to a wavelength λ34 and is able to receive a wireless signal of a radio frequency having a resonance frequency f34 between the resonance frequencies f30 and f33. - The
antenna 401 configured as described above receives vertically polarized radio waves parallel to the X-axis direction. When the radio waves are received by theantenna 401, a received signal received by theantenna 401 is outputted to awireless communication circuit 104 via thefeeding point 319 and a feeder cable. Moreover, since the radiatingantenna element 314 is provided, wireless signals having the resonance frequencies f33 and f34 can be received in addition to wireless signals having the resonance frequencies f30, f31 and f32, and a wider bandwidth is provided than that of the prior art inverted F antenna. - In general, when one band is handled by two radiating elements, if a difference between two radiative stopping resonance frequencies is comparatively large, there is such a possibility that a null point (antiresonance point) is generated in the band. In the case of the present embodiment, the thirtieth to thirty-fourth radiating elements are operated by diverging the path of a current flowing in the
antenna 401 at the divergingportion 311C, and therefore, antiresonance occurs to generate a null point in the frequency characteristic of the gain of theantenna 401. According to the present embodiment, the divergingportion 311C is configured to have a width set to be expand from one end side of the feedingantenna element 311 toward theconnection point 313 a, and therefore, a wide band can be achieved. Further, it is possible to raise the frequency at the null point by reducing the inductance of the divergingportion 311C and move the point to the outside of the frequency band for the terrestrial digital television broadcasting. - Referring to
FIG. 22 , theantenna 402 is an inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 321, agrounding antenna element 322, radiatingantenna elements feeding point 329 provided at theedge portion 102 a. In this case, the feedingantenna element 321, thegrounding antenna element 322, and the radiatingantenna elements dielectric substrate 320. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 320. - Referring to
FIG. 22 , one end of the feedingantenna element 321 is connected to thefeeding point 329. The feedingantenna element 321 extends in the Y-axis direction from thefeeding point 329, while another end of the feedingantenna element 321 is connected to aconnection point 323 a of the radiatingantenna element 323. In this case, another end of the feedingantenna element 321 includes a divergingportion 321C. The divergingportion 321C has a width set to expand from its one end side connected to thefeeding point 329 of the feedingantenna element 321 toward theconnection point 323 a. The radiatingantenna element 324 extends in the −X-axis direction from the divergingportion 321C, thereafter extends in the Y-axis direction to an edge portion of thedielectric substrate 320, and is connected to apredetermined connection point 323 b of the radiatingantenna element 323. - Moreover, referring to
FIG. 22 , the radiatingantenna element 323 is configured to includeelement portions element portions connection point 323 b, and theelement portions connection point 323 a. Theelement portion 323B is formed to be substantially parallel to the −X-axis direction along an edge portion of thedielectric substrate 320 from theconnection point 323 a to theconnection point 323 b. - Moreover, referring to
FIG. 22 , one end of theelement portion 323A is connected to theconnection point 323 b, and another end of theelement portion 323A is anopen end 323 c. Further, theelement portion 323C extends from its one end connected to theconnection point 323 a to itsother end 323 d connected to one end of thegrounding antenna element 322 substantially in the X-axis direction along an edge portion of thedielectric substrate 320. Further, referring toFIG. 22 , thegrounding antenna element 322 extends from its one end connected to anotherend 323 d of theelement portion 323C substantially in the −Y-axis direction along an edge portion of thedielectric substrate 320, while anotherend 322 a of thegrounding antenna element 322 is grounded by being connected to theedge portion 102 a. - As described above, the
antenna 402 is configured to include thegrounding antenna element 322 having oneend 322 a connected to thegrounding conductor 102, the radiatingantenna element 323 that is formed to be substantially parallel to theedge portion 102 a of thegrounding conductor 102 and has oneend 323 d connected to another end of thegrounding antenna element 322, the feedingantenna element 321 configured to connect thefeeding point 329 with theconnection point 323 a on the radiatingantenna element 323, and the radiatingantenna element 324 configured to connect the connection point 321 a on thefeeding antenna element 321 with theconnection point 323 b on the radiatingantenna element 323. - The
antenna 402 configured as described above includes thirty-fifth to thirty-eighth radiating elements. In this case, as shown inFIG. 22 , the thirty-fifth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 329 to theopen end 323 c of the radiatingantenna element 323 via thefeeding antenna element 321, theelement portion 323B, and theelement portion 323A. The electrical length of the thirty-fifth radiating element is set to λ35/4 that is a quarter of wavelength λ35, and the thirty-fifth radiating element resonates at a resonance frequency f35 corresponding to the wavelength λ35 and is able to receive a wireless signal having a radio frequency of the resonance frequency f35. Moreover, the thirty-sixth radiating element is a loop antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 329 to anotherend 322 a of thegrounding antenna element 322 via thefeeding antenna element 321, theelement portion 323C, and thegrounding antenna element 322. The electrical length of the thirty-sixth radiating element is set to λ36/4 that is a quarter of wavelength λ36, and the thirty-sixth radiating element resonates at a resonance frequency f36 corresponding to the wavelength λ36 and is able to receive a wireless signal having a radio frequency of the resonance frequency f36. - Further, referring to
FIG. 22 , the thirty-seventh radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from theopen end 323 c of the radiatingantenna element 323 to anotherend 323 d of the radiatingantenna element 323 via theelement portions connection point 323 a with the feedingantenna element 321 used as a feeding line. Moreover, the electrical length of the thirty-seventh radiating element is set to λ37/2 that is a half of wavelength λ37, and the thirty-seventh radiating element resonates at a resonance frequency f37 corresponding to the wavelength λ37 and is able to receive a wireless signal having a radio frequency of the resonance frequency f37. Moreover, the thirty-eighth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 329 to theopen end 323 c of the radiatingantenna element 323 via the element portion 321A, the radiatingantenna element 324, and theelement portion 323A. The electrical length of the thirty-eighth radiating element is set to λ38/4 that is a quarter of wavelength λ38, and the thirty-eighth radiating element resonates at a resonance frequency f38 corresponding to the wavelength λ38 and is able to receive a wireless signal having a radio frequency of the resonance frequency f38. - The
antenna 402 configured as described above receives vertically polarized radio waves having a polarization direction parallel to the Y-axis direction. When the radio waves are received by theantenna 402, a received signal received by theantenna 402 is outputted to awireless communication circuit 104 via thefeeding point 329 and a feeder cable. Moreover, since the radiatingantenna element 324 is provided, a wireless signal having the resonance frequency f38 can be received in addition to wireless signals having the resonance frequencies f35, f36 and f37, and a bandwidth wider than that of the prior art inverted F antenna is provided. - Moreover, since the thirty-fifth to thirty-eighth radiating elements are operated by diverging the path of the current flowing in the
antenna 402 at the divergingportion 321C, antiresonance occurs to generate a null point in the frequency characteristic of the gain of theantenna 402. According to the present embodiment, the divergingportion 321C is configured to have a width set to expand from the one end side of the feedingantenna element 321 toward theconnection point 323 a, and therefore, a wider band can be achieved. Further, it is possible to raise the frequency at the null point by reducing the inductance of the divergingportion 321C and move the point to the outside of the frequency band for the terrestrial digital television broadcasting. - Referring to
FIG. 22 , theantenna 403 is a modified inverted F antenna, and is configured to include thegrounding conductor 102, a feedingantenna element 331, animpedance adjusting element 332, a radiatingantenna element 323, and afeeding point 339 provided at theedge portion 102 a. In this case, the feedingantenna element 331, theimpedance adjusting element 332 and the radiatingantenna element 333 are each made of a conductive foil of copper, silver or the like formed on adielectric substrate 330. It is noted that no grounding conductor is formed on the back surface of thedielectric substrate 330. - Referring to
FIG. 22 , one end of the feedingantenna element 331 is connected to thefeeding point 339. The feedingantenna element 331 extends in the Y-axis direction to an edge portion of thedielectric substrate 330, and is thereafter connected to apredetermined connection point 333 a of the radiatingantenna element 333. Moreover, theimpedance adjusting element 332 has one end connected to theconnection point 333 a, and anotherend 332 a connected to thegrounding conductor 102 a. Theimpedance adjusting element 332 extends from theconnection point 333 a in a predetermined direction between the X-axis direction and the −Y-axis direction, and is thereafter connected to thegrounding conductor 102 a. - Moreover, referring to
FIG. 22 , the radiatingantenna element 333 is configured to includeelement portions connection point 333 a. Theelement portion 333A extends from its one end connected to theconnection point 333 a to its other end that is anopen end 333 c substantially in the −X-axis direction along an edge portion of thedielectric substrate 330. Theelement portion 333B extends from its one end connected to theconnection point 333 a to its other end that is anopen end 333 b substantially in the X-axis direction along an edge portion of thedielectric substrate 330. - The
antenna 403 configured as described above includes thirty-ninth to forty-first radiating elements. In this case, as shown inFIG. 22 , the thirty-ninth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 339 to theopen end 333 c of the radiatingantenna element 333 via thefeeding antenna element 331, and theelement portion 333A. The electrical length of the thirty-ninth radiating element is set to λ39/4 that is a quarter of wavelength λ39, and the thirty-ninth radiating element resonates at a resonance frequency f39 corresponding to the wavelength λ39 and is able to receive a wireless signal having a radio frequency of the resonance frequency f39. Moreover, the fortieth radiating element is a monopole antenna configured to include a radiating antenna element that includes a portion extending from thefeeding point 339 to theopen end 333 b of the radiatingantenna element 333 via thefeeding antenna element 331, and theelement portion 333B. The electrical length of the fortieth radiating element is set to λ40/4 that is a quarter of wavelength λ40, and the fortieth radiating element resonates at a resonance frequency f40 corresponding to the wavelength λ40 and is able to receive a wireless signal having a radio frequency of the resonance frequency f40. - Further, the forty-first radiating element is a conductor-loaded monopole antenna configured to include a radiating antenna element that includes a portion extending from the
open end 333 c of the radiatingantenna element 333 to theopen end 333 b via theelement portions - The
antenna 403 configured as described above receives vertically polarized radio waves having a polarization direction parallel to the Y-axis direction. When the radio waves are received by theantenna 403, a received signal received by theantenna 403 is outputted to thewireless communication circuit 104 via thefeeding point 339 and a feeder cable. Theimpedance adjusting element 332, which is connected to thegrounding conductor 102, does not contribute to the radiation of radio waves by the aforementioned thirty-ninth to forty-first radiating elements. Therefore, no ground current flows in thegrounding conductor 102 when the radio waves are received by theantenna 403. - According to the present embodiment, the
antennas antenna 401 receives horizontally polarized radio waves while theantenna 402 receives vertically polarized radio waves. Therefore, the direction of a ground current in accordance with the receiving operation of theantenna 401 and the direction of a ground current in accordance with the receiving operation of theantenna 402 are orthogonal to each other. Therefore, the isolation between theantennas antennas - Moreover, although a ground current flows in the
grounding conductor 102 when the radio waves are received by theantenna 402, no ground current flows in thegrounding conductor 102 when the radio waves are received by theantenna 403. Therefore, the isolation between theantennas antennas - Further, the
antenna 403 receives vertically polarized radio waves while theantenna 404 receives horizontally polarized radio waves. Therefore, the isolation between theantennas antennas antennas - Moreover, according to the present embodiment, since the
antennas 401 to 404 can be provided in the vicinities of thegrounding conductor 102 and theloudspeaker 102 s, theelectronic device 100 can be further reduced in size than those of the prior art. Moreover, since the antenna casing for housing the antenna apparatus including theantennas 401 to 404 needs not be provided in the others than the main body casing of theelectronic device 100, it is less expensive and superior in water resistance than those of the prior art. - Although the
grounding conductor 102 is used as the grounding conductor for theantennas 401 to 404 in the present embodiment, the present disclosure is not limited to this. It is acceptable to use the grounding plate of the electronic device, such as the shield plate of the electronic device as the grounding conductor for theantennas 401 to 404. Moreover, although thegrounding conductor 102 has a rectangular shape in the present embodiment, the present disclosure is not limited to this, and the conductor may have an arbitrary shape. - The aforementioned embodiments have been described as illustrations of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this but applicable also to embodiments that are arbitrarily subjected to modifications, replacements, additions and omissions. Moreover, it is also possible to provide new embodiments by combining the constituent elements described in the aforementioned embodiments. Accordingly, other embodiments are illustrated below.
- Although the
dielectric substrates grounding conductor 102 in the aforementioned embodiments and modified embodiment, the present disclosure is not limited to this, and it is acceptable to fix the dielectric substrates in mutually different planes parallel to thegrounding conductor 102. - Moreover, although the antenna apparatus having the four antennas wirelessly receives the radio waves in the frequency band for the terrestrial digital television broadcasting in each of the aforementioned embodiments and modified embodiment, the present disclosure is not limited to this, and a wireless signal from the
wireless communication circuit 104 may be wirelessly transmitted. - Furthermore, although the present disclosure has been described by taking the
electronic device 100 that is a portable type television broadcasting receiver apparatus for receiving the radio waves in the frequency band for the terrestrial digital television broadcasting as an example in each of the aforementioned embodiments and modification, the present disclosure is not limited to this but applicable to awireless communication apparatus 105 including the aforementioned antenna apparatus and awireless communication circuit 104 for transmitting and receiving wireless signals by using the antenna apparatus. - Moreover, the present disclosure is applicable to electronic device such as a portable telephone including the aforementioned wireless communication apparatus and a display apparatus for displaying the video signal included in the wireless signals received by the wireless communication apparatus.
- Moreover, the
antennas 1 to 4, 1A to 4A, 201, 203, 401 and 402 are inverted F antennas in the aforementioned embodiments and modification, the present disclosure is not limited to this. - Moreover, the antenna configuration of the second embodiment may be applied to the antenna of the first embodiment.
- As described above, the embodiments have been described as illustrations of the technology in the present disclosure. For the above purposes, the accompanying drawings and the detailed description are provided.
- Therefore, the constituent elements described in the accompanying drawings and the detailed description may include not only indispensable constituent elements for solving the problems but also constituent elements that are not indispensable for solving the problems in order to illustrate the aforementioned technology. Therefore, it should not be immediately certified that those constituent elements, which are not indispensable, are indispensable by the fact that those constituent elements, which are not indispensable, are described in the accompanying drawings and the detailed description.
- Moreover, the aforementioned embodiments are for illustrating the technology in the present disclosure, and therefore, various modifications, replacements, additions, omissions and the like can be performed within the scope of the claims and a scope equivalent to them.
- As described above, the antenna apparatus, the wireless communication apparatus and the electronic device of the present disclosure are applicable to a portable type television broadcasting receiver apparatus for receiving the radio waves in the frequency band for the terrestrial digital television broadcasting. Moreover, it is applicable to a wireless communication apparatus including a wireless communication circuit for transmitting and receiving wireless signals by using the antenna apparatus, and an electronic device such as a portable telephone including the wireless communication apparatus, and the display apparatus to display the video signal included in the wireless signals received by the wireless communication apparatus.
- Although the present invention has been fully described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications are apparent to those skilled in the art. Such changes and modifications are to be understood as included within the scope of the present invention as defined by the appended claims unless they depart therefrom.
Claims (11)
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JP2012-027266 | 2012-02-10 | ||
JP2012027266 | 2012-02-10 | ||
PCT/JP2013/000401 WO2013114840A1 (en) | 2012-01-31 | 2013-01-25 | Antenna device |
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PCT/JP2013/000401 Continuation WO2013114840A1 (en) | 2012-01-31 | 2013-01-25 | Antenna device |
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US13/955,510 Active 2034-05-24 US9620867B2 (en) | 2012-01-31 | 2013-07-31 | Antenna apparatus including two pairs of antennas provided respectively to be symmetric with respect to symmetric line |
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Also Published As
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WO2013114840A1 (en) | 2013-08-08 |
JPWO2013114840A1 (en) | 2015-05-11 |
US9620867B2 (en) | 2017-04-11 |
JP5657122B2 (en) | 2015-01-21 |
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